Senior Backend Engineer (FastAPI)

comm1t is a specialist IT recruitment agency delivering top engineers across Poland and Europe. They combine experienced recruiters with autonomous AI agents and focus on quality, sourcing engineers who aren't actively job hunting but are open to the right move. They provide personalized candidate matching and support through onboarding and the first months to ensure lasting placements.

• Seven years or more delivering production backends
• Experience thinking in failure modes, not just the happy path
• Experience with LLM systems (RAG, tool-calling, agents) or strong interest in them
• Proficiency with AI coding tools and strong code quality standards
• Ability to adapt to changing startup plans
• 6+ years Python experience
• 3+ years FastAPI experience
• Experience with PostgreSQL / SQL
• 2+ years Redis experience

• Architect and ship the APIs and services that everything else depends on
• Own the AI plumbing end to end: retrieval, orchestration, tool-calling, streaming, and evaluation of results
• Make async and distributed workloads rock-solid, including document ingestion, embeddings, and long jobs running on Redis
• Integrate with client systems (email, document stores) and harden them for real-world traffic
• Prioritize data security and isolation due to sensitive client material

The administrator of personal data is comm1t, located in Wiskitki, ul. Kościuszki 66B. Personal data is processed for recruitment purposes with rights to access, correction, deletion, restriction, objection, data portability, and complaint to supervisory authority. Providing data required by labor law is mandatory; refusal may prevent recruitment. Data is processed until recruitment ends and for potential claims. Consent for future recruitment can be withdrawn anytime. Data recipients include Rocket Jobs and other entities processing recruitment data.